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Equating of Subscores and Weighted Averages Under the NEAT Design CE NEAT

Sinharay, Sandip; Haberman, Shelby J.
Publication Year:
Report Number:
ETS Research Report
Document Type:
Page Count:
Subject/Key Words:
Augmented Subscore, Chain Equating (CE), Equating, Weighted Average, Non-Equivalent-Groups Anchor Test (NEAT) Design


Recently, the literature has seen increasing interest in subscores for their potential diagnostic values; for example, one study suggested the report of weighted averages of a subscore and the total score, whereas others showed, for various operational and simulated data sets, that weighted averages, as compared to subscores, lead to more accurate diagnostic information. To report weighted averages, the averages should be comparable across different test forms; that is, the averages should be equated. This report discusses how to equate weighted averages. Results from operational and simulated data sets demonstrate the small error found when equating weighted averages.

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